Carbureter attachment.



F. L McCULLO C H. "CARBURETEB ATTACH MENTf- APPLICATION -FIL ED0CT- 16, 1916.

Q Patented Apr. 9', 1918.

E'Lifcl'zzllach,

F mccuuocn. CARBURETER ATTACHMENT. I APPLiCATlON riuao' OCT. '16. 191-6. I 1 ,262,2 1 9.; Patented Apr; 9, 1918.

' 2 SHEETSL 2. I

funny induce a flow from the fuel tank,

'ing at Tampa,

FREDERICK L. McCULLOCI-I, or

DORCHES'IER, 0F TAMPA,

sic.

TAMPA, FLORIDA, AS SIGNOR TO WATSON ELISAPH FLORIDA.

CARBURETER ATTACHMENT.

Specification of Letters Patent.

Application filed October 16, 1916. Serial No. 125,989.

To all whom it may concern Be it known that I, FREDERICK L. MGCUL- LOCH, a citizen of the United States, residin the county of Hills'boro and State of Florida, have invented certain new and useful Improvements in Carbureter Attachments; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to improvements in carbureter attachments, and more specifically consists in connecting a conduit between the usual float chamber, or other fuel receiving chamber, of the carbureter and the intake of the engine so as to place the same in direct communication, whereby the float chamber will be placed under the influence of the suction produced by the engine cylinders, and which suction, creating a partial vacuum in the float chamber, will which may be placed at a lower level on the vehicle, as at present generally done.

It is the primary aim and object of my invention to dispense with a separate and distinctvacuum tank with all its attendant parts and connections, and to also eliminate the necessity of including pumps in the gasolene line in order .to compel the fuel to flow from the main tank to the float chamber of the carbureter which is generally placed at an elevation over said tank.

Such added devices as vacuum tanks and pumps increase the cost of manufacture and the complexity of the system, and are troublesome in the'matter of correct adjustment; and, moreover, provide additional chambers and pipes that may beficlogged by foreign matter in the fuel.

By my improved attachment such added devices are entirely dispensed with and the float chamber of the carbureter directly converted into a vacuum tank, serving at once as the fuel receiving chamber for the carbu reter under the control of the usual float valve, and a vacuum chamber which will, when the float. valve is opened, induce a flow of the fuel from themain tank to said chamber.

Other. objects ofmy invention consist 'in providing regulating means for maintain- 'ing the degree of partial vacuum in the float chambers substantially constant, such means a part of this application, and in which similar reference symbols indicate corresponding parts in the several views:

Figure 1 is a side elevational view of a vehicle shown partly broken away to illustrate my improved carbureter attachment as applied thereto.

Fig. 2 is an enlarged front elevational view, partly in section, of the carbureter, with and ig. 3 is a'side elevational view of the carburetor shown parts of the attachment also illustrated.

Referring more particularly to the drawings, in Fig. 1 is shown an automobile indicated generally at 1, and having a main fuel tank 2 illustrated as' mounted on the rear thereof, but which obviously may be placed at any other location thereon. This fuel tank 2 receives the gasolene or other fuel, which may be poured through a filling neck which is closed by the usual cap having an air vent therein through which atmospheric pressure is admitted to the surface of the fuel therein. The tank may be equipped with the usual devices which, however, form no part of the present invention and are therefore not here illustrated. The

Patented Apr. 9, 1918.

my improved attachment fitted thereto gfl,

iforms a part of the broadly including an air valve which repartly in section and with terminating in a boss at the purpose of receiving all of' usual carburetor construction designated genorally at 5, and which i shown in the present drawings as being the Stewart carbureter at present in use on the Dodge Brothers motor car. It will be appreciated, however that the invention is notlimited to an application to this type of carburetor, but may be employed onother ypes with qu lly ood tail.

coupled results. The carburetor construction forms no part of the present invcntion andtherefore only such portions thereof as are necessary to an accurate understanding of the present improvement. are illustrated in de- Adjoining the float chamber 4 is the aspirating chamber having the usual devices therein for regulating the supply of gasolene from the float chamber to the mixing chamber 6. With the aspirating tube communicates the air supply 7 which is formed by an extension of the carburetor shell 5. This extension or air inlet 7 is adapted to be closed by a cover 8 having formed therein a concentric series'of openings 9, which are preferably radially elongated as shown'in the drawings. These openings 9 are adapted to place the extension 7 in communication with the outside atmosphere.

A flaring mouth 10 is formed in one piece or attached to the interior of the cover 8 and projects within the extension 7 presenting a large area to be placed under the influence of the suction created by the action of the pistons of the engine. The flaring 8 may be secured in the advanmouth 10 and cover extension 7 vin any suitable manner, tageously' I the edge of said mouth 10 is formed ,with a notch 11, which is received through a lug 12 on the extension 7. After'the device has been inserted the cover 8 is turned so that the notch 11 moves out of registry with the lug 12, and the parts thereby become locked in place.

The cover 8 is provided on its exterior with a boss 13 forming a socket in' which is fitted one arm of an elbow 14, to the other end-of which is connected a pipe or.equivalent conduit 15, whiclrhas its opposite end in a second elbow 1(5 fitted in the top of the float chamber 4 and having open communication .iherewitlu It will thus be seen thatthrough these. various passages the mix: ing chamber Gila-s continuous and nninterrupted communication with the top of thefloat chamber 4 above the liquid fuel therein. Consequently the suction developed by the pistons of the engine. cylinders in d'esceuding on theintake strokes will. operate to draw the air through the conduit 15 "from the upper part of the float chamber 4, thereby creating a partial vacuum therein.

n is desirable that this partial vacuum in the float chamber .4 be kept substantially uniform, for this purpose air from the atmosphere may be admitted to the openings 9 in the cover 8 to meet the increased suction demands of the engine when running at high speed. This ingress of air from the atmosphere 11.- advantageously under the control of a circular register valve 17 having a 18 extending substantially series of. port shape corresponding to the in position and as shown in the drawings, wherein 'np by whatever air may be present in openings 9 in the cover 8, in order to register completely therewith when the engine is running at maximum speed and thereby relieve the increased suction demanded thereby.

This valve 17 is mounted for rotation on the boss 13. and is subject to control in moving to mask or partially mask the openings 9 in the cover p ate. The operation of this valve 17 is advantageously accomp ished from the throttle control by a loose connection. The throttle valve-1s indicated at 19 formed with a curved indentation entered by the lug 25 for purposes of smooth operation and yielding the required loose joint. The outletof the carburetor, communicating. with the manifold of the engine, isindicated at 28.

A brief description of theoperation will serve toimake clear the functioning of the various parts."

As indicated in the drawings, when the throttle valve 19 is closed the loose connection therebetween and the valve 17 will serve to shift the openings 9 and the ports 18 completely or almost completely out of registry so that no appreciable air'from the outside atmosphere will suction produced by the engine cylinders, but this eng ne suction will be entirely taken the art of the float chamber 4; which air upper p will be delivered to the engine through the conduit 15 and thereby leave a partial vacuum above the fuel in said float chamber 4. When the float device in the chamber 4 operates to open the valve, the partial vacuum in the float chamber will relieve the upper surface of the fuel from appreciable pressure, while the atmospheric pressure. on the upper surface of the fuel in the main fuel tank -2 will be operative'to drivesuflicient fuel from said main tank through the connection 3 and into the float chamber 4 to replenish the same to the constant level maintained therein by the float device.

After this constant level has been attained, the float will-rise in the usual mancreases in speed so will the suction become be admitted to relieve the 19 is opened wider,

greater, and if not relieved will entirely devolve upon the float chamber 4': Too high degree of vacuum in the chamber 4 might interfere with the proper functioning of the float device, and it is therefore desirable to keep the same substantially constant; this being done by admitting air from the outside atmosphere which will take up the increased pressure as the engine advances in speed. Accordingly, as the throttlevalve the arm 22 will be corand through the lugs the arm 26 and valve the valve 17 the openmay be opened and or less amount of air respondingly moved, 24 and 25 will shift 17. By thus moving ings 9 and ports 18 closed, and,,,a greater admitted in accordance with the speed of the engine.

It will be seen that by the present arrangement all necessity of a separatevacuum tank is dispensed with, and the use of any more parts than the usual carbureter, excepting the small connection made by the present invention, are rendered entirely unnecessary.

It is obvious that those skilled in the art may vary the details of construction and arrangement of parts without departing from the spirit of my invention, and therefore I do not wish to be limited to such features except as may be required by the claims.

I claim 1. A carbureter having an air inlet and a fuel-receiving chamber, a cover for said air inlet having a radial series of ports, a mouth projecting inwardly from said cover and centrally with respect to said series of ports, a connection between said fuel-receiving chamber and mouth, a valve having a series of. ports adapted to register with the ports and means to actuate said ries of ports adapted to' register with the 'ports in said cover, substantially as described,

3. A carbureter having a fuel chamber and an air inlet, a cover having ports therein air inlet, atvalve havlng Y secured over said ports adapted to register with said firstmentioned ports, a connection between said chamberand cover to withdraw the air from the former, an arm on said valve, a second arm actuated from the throttle mechanism, and flanges on said second arm engaging said first-named arm, substantially as described.

In testimony whereof, I affix my signa ture.

FREDERICK L. MoGULLOCH. 

